声音简介
牛顿与苹果
It explains why things feel light or heavy in our hands and what makes things fall to the ground.
What Issac Newton found was that everything pulls on everything else with a force no one can see. Heavy things pull harder than light ones.
王者归来有木有
ε=ε=ε=ε=ε=ε=┌(;￣◇￣)┘溜了溜了
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